Environment variables

Defining environment variables

Environment variables can be set with environment.variables, environment.sessionVariables, and environment.profileRelativeSessionVariables. For example, for the XDG Base Directory Specification, the following could be set to /etc/nixos/configuration.nix:

{
 # ...

  environment.sessionVariables = rec {
    XDG_CACHE_HOME  = "\${HOME}/.cache";
    XDG_CONFIG_HOME = "\${HOME}/.config";
    XDG_BIN_HOME    = "\${HOME}/.local/bin";
    XDG_DATA_HOME   = "\${HOME}/.local/share";

    PATH = [ 
      "\${XDG_BIN_HOME}"
    ];
  };

 # ...
}